A 10 or 15 dollar difference is hardly more than a ten percent hike for significantly newer technology and faster speeds, which is well worth the speed increase for someone like me who uses my droid almost exclusively as a computer/mp3/gaming/streaming device
You're looking at it wrong. Imagine you have a computer you bought six years ago for $600. You want to buy a new computer today, and you buy a new one for $400 that absolutely blows your old one out of the water.
You shouldn't accept a higher price just because the speed of the data network is increasing. Instead, think of how you've been paying the same price (roughly) since Verizon's 3G network came out way back in 2003. The tech is almost seven years old already, and now they want you to pay more as it gets faster? I say no, it should be an evolutionary step... we should continue to pay the same rate and have the technology upgraded.