As someone who has collected and painted both 40k miniatures (I have 4 armies around 1500 points each) and Btech for several years, I thought I'd chime in and say I tend to be in the same camp as Stone Rhino regarding price.
When I first got into 40k, I used to purchase at least one item per month of Games Workshop product, which usually meant a single figure or kit I could comfortably work on and complete during that period. Then prices started going up, but Games Workshop pointed out that part of the reason for this was the number of options and different items being added to the kits. While I agree the quality of Games Workshop kits remains very high, and the options are nice, as prices continued to rise I found myself needing to pay double or triple what I spent previously for kits. Also, after I completed my kits I had sprue after sprue of parts I really couldn't use for anything else. I'm not talking about things like Space Marine extra weapons or heads, but things like walker arms or legs that are cut so they ONLY fit on a particular kit and nothing else.
I still like Games Workshop games and Games Workshop miniatures, but one of the reasons I'm painting a lot more Battletech these days is because the price is far more affordable. If Battletech miniatures went the route of GW--doubling or tripling in price to add more "bling" and extras--I don't think I'd continue painting the miniatures. It's just not reasonable on my budget. Given the choice between a very decent model I can afford (and I think that the IWM offerings of the past few years have been quite satisfactory for me) and one that is super-elaborate but extremely expensive (like the beautiful but running into triple digits Imperial Knight from GW), I'd rather have the affordable option. For my purposes, I think the array of optional bits that can be purchased through IWM to customize 'Mechs is quite reasonable as is.
To the OP: It seems you have very strong negative feelings toward the Battletech miniatures line, and don't seem persuaded by those that have positive feelings toward it. My impression of most Battletech players (including myself) is that they are pretty relaxed in regard to proxying alternate miniatures, especially given the issues with the old Unseen. For example, I love the recent "primitive" Thunderbolt, and dislike the older Phoenix and even the "Classic Era" Tbolt sculpts, so I simply use the "primitive" resculpt in place of the older minis. People have been interested by the new Robotech mini line for the same reason.
I've posted a couple of primitive re-sculpts I've painted in the Miniatures forum using paint schemes from different time periods, and no one has ever said to me "ZOMG! That is SO the wrong historical period for that 'Mech! #fail." Quite the opposite-response has been very positive to my 'proxies.' I see other painters who occasionally get very positive feedback on their CAV minis here.
In your earlier posts, you mentioned that you like other lines like CAV, so why not simply use one or more designs that are closer to your vision of what the game should look like in place of Btech sculpts you don't like?