Sorry, Ply, but I'm gonna have to shoot this idea down. Right now, there is a balance in research; you can either research at low cost, or you can actually have use of the higher level program. If I research AV for 100 hours, I will have my low version AV for all of them; if I research it for 50, I can use it during the later 50, at the cost of more resources.
If it ain't broke, don't fix it.
There is no balance except by the HPD Cost. I played around checking a few things out and if I had the HPD Income I could create a V 18K+ program in 92 days with a milestone every single day.
I do think there should be an increased cost the higher a program goes but that would create a lot of excess server load on the back end as it calculates every single research and looking at what it's level will be when done, if there is any other research affecting the same file, etc.
However SGP has suggested similar things in the past only to have them shot down. This was anyone one of the ways to slow down the progression in the game.