If you want to sell services to large companies--even low cost ones--you need to offer invoice payment. At a big company, the corporate credit card is for meals and travel, not for paying vendors.
In my experience, if you send a proforma invoice, a W9, a federal tax id, and a soul sourcing statement, at the end of the signup form, many times a check will just show up in the mail. It is possible to do invoice payment without having a high touch sales process. You just have to preemptively provide all the stuff the AP department needs. I really think 37 signals is leaving quite a bit of money on the table by not…
I think you meant sole, but I had to laugh at this meaning as well in the whole scheme of dealing with finance departments.