Good news, WS Form has added support for ACPT Custom Post Types and custom fields. You can now use the two together. Here is the announcement, which includes a link to a YouTube video on how to make a WS Form with ACPT and a coupon code for a 20% discount on WS Form.

This is a good discussion with Mark Westguard about starting and running the WS Form plugin business. It provides an interesting take on launching a product, how he approaches marketing, pricing, and challenges.