For me, I don't care enough about a ship that lasted 1+ seasons of a Star Wars show to drop over $500 on it. $200-300? Sure. If Lego is going to charge me $500 for a UCS, it better be something impressive along the lines of a Venator.
Outside of a few UCS ships that area going to be larger and command a higher price, I think that $200-250 is a sweet spot like the X-Wings, Y-Wings, Snowspeeders, etc. For the higher price point, give me that large Geonosian Arena, Endor Bunker/Ewok Village type set that is of a grander scale. A single ship that holds little importance (to me at least) is not getting my $500.
Bottom line, it's not the money, it's what I feel I'm getting for that money. I have no problem with the price of the ISD or AT-AT, but a similar price for a Razor Crest just doesn't sit well with me. I'll BL the figures and move on.