That's true. I've run a 300 point game once, and it was pretty fun.
Look, I respect the idea you suggested, but if I have the money and they have the ships, then I'll buy them because I need ships in my fleet. I still want more Y-wings (at least two more), another HWK, a couple more TIE Advanced x1s, a couple more A-wings, definitely some more Slave Is, a couple Shuttles, a couple more B-wings, and I DEFINITELY want some TIE Bombers.
The cards are the main reason. Will I ever field that many HWK-290s? Probably not unless it's a big fleet. But I want more Saboteurs and Intelligence Agents for my crewed ships. Same goes for Push The Limit in the A-wing, Heavy Laser Cannon in the Slave I, and Fire-Control System from the B-wing. I feel really limited without a bunch of those cards to spread between my ships.