I run a SAAS product and I have learned that it is OK to ask for their email if someone is really serious about using your app. Yes give them the test access to

I run a SAAS product and I have learned that it is OK to ask for their email if someone is really serious about using your app. Yes give them the test access to sandbox, demo whatever but at least get their information in return so you can follow up with them for feedback as well. Remember, it is not just about getting people to pay. Here is what I will do. Give them access to a sandbox but let them create their own userid for it if possible using their email etc. This way, you now know how many actual users are trying your app. This will also reduce the number of non-serious users as well. Yes this may cause some users to not try the app but in my experience, any user who does not give you at least their email to try your app is very unlikely to become a paying customer.