Sort:  

It is relative to votes cast. Only SP that actually votes during the relevant reward period is what counts.

If only one person with a tiny 10 SP minnow account cast one vote, that vote would be "worth" the entire reward pool! Currently about 20 000 USD per day!

So that explains well, why rewards nowadays are getting smaller, its because lots of people are casting their votes.

What could possibly happen then if the steemit population reaches a million? Could it mean lesser and lesser rewards?

More a function of the market price of STEEM. Rewards are generated in STEEM, but then converted to SBD (and STEEM/SP). Lower price of STEEM is lower rewards. But, yes, more votes being spread out is a factor too.

Im learning here. How to possibly increase the STEEM price?

Only by being more attractive to investors. I can't give a simple answer there, as it depends on many factors such as adoption, utility, potential earnings/yield, prospects for future appreciation, etc.

About investor. Im in the process of convincing an investor but Im having hard times because Im not that familiar with the steemit economy. Any advice on how to make the proposal appealing would be an advantage.

Coin Marketplace

STEEM 0.17
TRX 0.15
JST 0.028
BTC 59893.00
ETH 2414.92
USDT 1.00
SBD 2.43