Sort:  

I thought the bot only do vote on its 98%-100% VP. But even if the bot does that way, the average profit in 3 -5 days is still remaining the same overall!

98%-100% - this is how bidding bots operate, @tipU is not one of them ;)
And yes, the average total profit for each 3-5 days periods is roughly the same, although there were times when @tipU had unused VP for several days and used all of it after this period.

Also the STEEM price influences how much profit can be generated.

Coin Marketplace

STEEM 0.15
TRX 0.16
JST 0.028
BTC 67779.88
ETH 2396.01
USDT 1.00
SBD 2.32