Here's how: Auction the visas with a high reserve. That way the R&D slots that pay above market get nicked for a bit extra, that the employers will find a little inconvenient but nothing compared to the product not getting done. But for an outsourcing shop that wants a seatwarmer at the lowest price possible, a competitive aution is 90% unsupportable. They won't be able to tolerate negative margins for a year or two.