the game is fun but lets check the math:
prod. cost | sell price | profit
press | .25$ x 12= 3$ | 6$ | 3$ = 100% profit
labeler | 3$ +( .25$ x 12) =6$ | 16$ | 10$ = 166,7% profit
filler | 6$ +( .5$ x 12) = 12$ | 32$ | 20$ = 166,7% profit
so why buy a filler if it makes the same profit percentage as the labeler?