How are you missing out on millions in sales if they never paid? If it was a financial net positive to stay, why did you leave? If it wasn't, you're not actually missing out on anything by not being there.

For the record I think a lot of European regulations are needlessly anti-business but this seems like an odd example. If management isn't willing to spend $20k (even on credit at onerous interest) to make millions of dollars, I don't think they'll be around very long.