You do need Royal Seal even if you drew your deck because Treasurer gains to hand.
Yes, I forgot Treasurers gains to hand. Considering this, you don't need to topdeck them if you use Toil instead of Gamble:
Events: Toil, Bonfire, Seaway, Training
Project: Capitalism (player cube already there)
Seaway +1 Buy token in Treasurer pile
Training + $1 token in Treasurer pile
Two Treasurers already in the trash
Two Treasurers in hand
1 – Skip action phase
2 – Play Treasurer – gain a Treasurer from trash ($4 – 2 Buys)
3 – Play Treasurer –gain a Treasurer from trash ($8 – 3 Buys)
4 – Buy Bonfire – trash two Treasurers from play ($5 – 2 Buys)
5 – Buy Toil ($3 – 2 Buys)
6 – Play Treasurer – gain a Treasurer from trash ($7 – 3 Buys)
7 – Buy Toil ($5 – 3 Buys)
8 – Play Treasurer – gain a Treasurer from trash ($9 – 4 Buys)
Repeat Steps 4 to 8 indefinitely for infinite money and buys