Lead Selling with CB Subs?

Hi I am currently develloping a lead generation plattform for suppliers and buyer prospects. Can I do the following with CB Subs?

Seller: sellers registration is live based on CB

Buyer prospect: selects a category and answers 10 questions in a form (with CBSubs?) and gives Name and phone number.

The 10 Answers are being stored in a document and should be offered to a group of sellers depending on their profile.
A Seller can preview the document and buy it with a single payment (donation).
A document will be sold only 3 times.

Can I do both kinds of registrations including different questionaires?
Can CBSubs deliver document preview?
Can the number of sales for a certain document be restricted on 3?

Is there an integration between CBSubs and an CRM component?

Thank you for short info whether this should work?

The only one of your requests CBSubs I can guarantee can do is provide different types of registration forms based on plans.

CBSubs is not intended nor designed to be used as a virtual store, you may want to look into Virtuemart to meet such needs.

Don't know what a CRM component is, but any integration is possible either by using CBSubs URL to trigger a script file or CBSubs SQL Actions using queries.