when Lafay signed, it was menetioned that the Ag2R deal is somewhere in the 1 million per year range, and that he actually had better offers from other teams. It's still a lot for a rider not racing, of course, but I wouldn't think it makes that much of a difference.
Sure, in general, they may have been a bit too lavish when spending those additional 3 million drom Decathlon deal (+money freed by GvA's retirement), but I guess the main problem is that all riders are somewhat overperforming now and consequently looking for more money (or already are earning more than expected, if their contracts include bonuses).