I agree that you can buy bad planes, but I think you may have gone in with premises that conflict with the price you paid. It seems like you paid a user-plane price, and then wanted (consciously or not) to have a new-looking tool, and have realized how much work you did to get it there. I will confess to a strong prejudice in this area: tools are for use. To make an analogy, it's the difference between a pickup truck that looks like it just came off the farm and a dent-free one with shiny paint and chrome wheels. Both of them will haul a load of straw or manure, though only one will look comfortable doing so. I have no problem with pretty shiny tools - I just bought a Lee Valley medium shoulder plane, and am keeping it in the plastic anti-rust bag so it stays pretty as long as possible - but, when it comes to making shavings, I don't particularly worry about how the tool looks, only how it works.
Some comments:
1. I clean off dead spiders and rust with an SOS pad and hot water - not sure of total cost (this isn't my shopping specialty), but I doubt it exceeds 50 cents - though one plane pretty well uses up one SOS pad. Then I wipe off the plane with paper towels (one cent?), spray it with WD40 (another cent? maybe two), wipe it down again, and apply furniture wax everywhere. I'm not going to count the cost of the can of wax, because you need a can of wax for any number of reasons anyway, and one can will last you five years. The tools don't wind up shiny, but they wind up working.
2. I've never flattened a plane sole. I don't even know how out of flat my current planes are, up to and including the No. 8. They seem to work. I have gotten rid of planes that were seriously out of flat, but only two - and I managed to turn one into a birthday present for a family member who wanted the concept of tools, but, I knew, would never actually use them (I still regret the spokeshave I gave him that birthday, but have replaced it, twice over, since).
3. Myself, I'd never buy a plane on deBay as a first plane. You should be able to touch it and look it over. Too many bad possibilities with eBay buying that are subtle enough that you need experience before buying a picture and a description.
4. Paint does not appreciably improve the performance of a plane. While a nice paint job will improve its aerodynamics, the effect doesn't kick in until you reach Mach 0.5, which takes some years of practice.
5. In my experience, absent real problems - and, indeed, you did have real problems with that yoke - 75% of getting a plane tuned up is getting the iron sharp, and 20% is waxing the sole and the operating surfaces.
Sorry if this sounded like a slam, but I think one of the wrong paths down which people, especially newcomers, are turning these days with hand tools is the path of thinking you can't make good shavings until the tool is pimped out. You can. I'm not sure how this path came about, exactly. Part of the origin was people who'd reached the point that they wanted to plane stuff so smooth that a fly that landed on the surface would slide right off unless it had lost all airspeed, and so developed standards of super-tuning. If you're planning to race your car at Indy, you need to know that stuff (can you tell I grew up in a car family?), but you don't start out racing, you start out driving on regular streets, and you need a car that's tuned well enough to get to the store and back. You can do SO much with a tool that's clean, sharp, and sound, but not tuned to the nth.
If really good-looking tools are important to you, and that's a perfectly legitimate attitude, then save your money until you can buy from one of the new tool makers. Just be aware that it's an element in your decision, and you'll be able to stay away from attempts to save money by buying something that requires a lot of work before it meets your image of an acceptable tool.