I believe that most modelers want to make something that they can feel proud of. Low poly just doesn't impress too many people. Maybe a better request might be to ask the modelers to be kind enough to include LODs for us. Atrahasis has started to do that with quite a few of his models and they run much better on my system than the originals did and his models look great. Wicked Zombie's Andro CA is another example of a very good looking model that has LODs and runs great, even in fleet battles. There are others. These are just some recent releases that come to mind.
There are some modelers that seem to take poly count into account and make nice looking lower poly models out there. Feral Yards, a lot of Desty Nova's, Terradyhnne's, etc...
...and thank you to Azel, for not minding to be asked to cap the polies. He made me some really nice Gorn meshes that I asked him to maintain a 2500 poly limit (+/- 10%). They look great. Very smooth and enough mesh detail that a good texturing job will finish them off nicely.
DISCLAIMER: I do enjoy and appreciate the hipoly, 40megs texture map beauties out there. They are wonderfull works of art and great models. They are obviously much more work than a 1500 poly one texture map model and should be appreciated for that. I intend no offense or disrespect to those models or the artists that create them.