your investors would loose out as soon as the difficulty rises.
and win out when it falls.
Which should be the case not that often, according to Moore's law.
The title is somehow misleading - you do NOT offer a 1 MH/s PPS income bond, you pay 1 week's worth of 1 MH/s at some random time on Sunday evening (depending on when difficulty changes you can then choose to pay on the higher difficulty). These payout calculations are also a breach of your contract:
The holder of this bond shall receive bitcoins equivalent to 100% PPS output of 1MH/s, for as long as they hold the bond.
Furthermore you want to offer only 100 shares at a price that is _very_ low compared to the rest of the market without any good reason - to me all of this sounds rather like a scam. To anyone investing in this: It is VERY easy to let some "mining bond" run like a Ponzi scheme (paying interest out of deposits) for quite some time, and as soon as the money runs low, he can always "expand" or "offer more bonds, as the initial experiment with 100 shares worked out so well!". All this can go on for half a year or more easily and he'd still have half of your money. As long as there's no proof of mining capability, I'd recommend to be VERY careful. Especially with an attitude up-front like the one here.