Big difference... either a good sign or a bad sign. Cheaper to buy

Yeah...but Rise will prolly end up being Lisk's answer to Litecoin vis-à-vis Bitcoin. When you look at it from this angle, unless Rise has some special secret sauce, its post-ICO "rise" (sry) will be comparable to Lisk's in percentage terms. Perhaps less.
I'm saying this as someone who bought 0.48
BTC's worth of Rise. It'll prolly offer a cheaper deployment environment for BaPPS, so in that sense it'll make for a good "livenet testnet."