let's start to say that you already have 384 gmp and you want to purchase till 500 gmp
what you gonna do purchase 100 gmp then 16 . i don't think so.
to be a human you have to make 2 actions
First action : to buy till reach [up to].
Second action : to buy at same randomly ( like 6 ) till reach [caps].
and on force refill better to add small randomize on [leave at]
it will become more as human
and as i said at previous quote with code better than GUI.