Here I go with the financial analysis again.
The problem with any of these threads is that its really impossible to truly know what anything in the forums goes for. Usually there is a behind the scenes negotiation going on, so its hard to know what the actual outcome is unless you print the actual deal terms. Shipping, cases, etc are all terms. You can probably guess what the best case is for the seller (asking price), but not the worst case. So any ideas you have about valuation are probably skewed upwards. this becomes more of a problem in periods of recession, where sellers are more likely to negotiate.
If the difference in a 2008 Fender (for example) is $200 once you include terms, then it goes from a semi decent 'investment' to a bad one very quickly. I never think of any gear as an investment. The best you can hope for is to 'rent' it for a while if you plan on selling it later.
Right now, we are in a period of such manufacturing efficiency that its impossible to truly predict what large scale produced items will become valuable later. Many of the boutique builders will find their stuff valuable later on, but the catch 22 is that the more they make, the more people know them, the more demand, but also the more they produce (supply) meeting demand and keeping prices low.
tl;dr forums unreliable for bass valuation.