On normal terms, you can only get 1 % money back into your Trumf account
If you use the Trumf visa card you get an extra 1% which makes for 2%. I make it a habit to stock up on all my stables (including beer)whenever there is a triple trumf.

Over time, I've built up a reserve that I can use to top of my EB extra points as needed. The good thing is that the transfer from trumf to EB extra points takes just a few minutes. Last week, I got a personal 30% reduction for award tickets with SAS. I was a couple of thousand short of what I wanted, so I went into my Trumf account and took out exactly what I needed to get the flight I wanted. Pretty good deal.