I remember many years ago when lipos hit the scenes in the R/C hobby market...a normal Nimh 9.6 volt 1200 Mah battery pack was about $29.00...but a lipo pack near the same ratings was around $ 80.....it took a few years, but now that same $80 lipo pack can be had for $ 19.99 ...
we will start seeing a simliar price drop with the larger voltage/Ah lipo packs used for bikes.,,,,they may not come down 70% in price like the smaller lipo packs did..but they will come down. I will bet on it.