[WhatDoYouThink!]

For random numbers, 1xSystem 7 and 7xOrdinary $1 make no difference.

For buying "lucky numbers" and if they strike, 7xOrdinary can get better prizes

In the above example, 4 wining numbers for 1xSystem 7 can get 3*50+4*10 = $190. But for 7xOrdinary can get 7*50 = $350.