> Hmm, probably true in some places, but here (Spain) that wouldn't even be legal. When I worked in sales we had minimum wage + commission, but I'm sure the salary would be 0 if they were allowed to set it up like that.

In the United States having "zero base bay" is hypothetical. If a full-time employee had no commission payouts they'd be compensated minimum wage as necessary to comply with laws.

Sales jobs often come with a warm-up period with either a higher base salary or they get paid part of their commission target for a number of months regardless of how many sales they make.