PayPal Recurring Payments with express checkout li

I have some questions about recurring payments using express checkout. On your developer web at the recurring payment page is stated:

To be able to create a recurring payments profile for the buyer, you must ensure that the buyer's PayPal account includes an active credit card.
You can create a maximum of 10 recurring payments profiles during checkout.
You can increase the profile amount by only 20% in each 180-day interval after you create the profile.

For the first statement: can you check that the buyer account has an active cc during express checkout? I mean, can you check that programmatically?

The second and third statement: what does that means 10 recurring payments profiles during checkout? 10 profiles totally or 10 profiles at once? If I will sell my subscription to 1000 customers, can I create 1000 recurring payments or the maximum is 10? What about if I set-up a recurring payment using CC instead of express checkout, are there any limitations to how many profiles you can create?

Can you check that the buyer account has an active cc during express checkout? I mean, can you check that programmatically? No, PayPal will take care of this for you.
What does that means 10 recurring payments profiles during checkout? 10 profiles totally or 10 profiles at once? 10 at one time. Assuming that you can get the buyer to agree to it, you can set up any number of recurring payments profiles with a single buyer, but you'd have to send them back to PayPal multiple times to approve all of them.
If I will sell my subscription to 1000 customers, can I create 1000 recurring payments or the maximum is 10? You can create 1000 recurring payments. There's no limit to the number of recurring payments profiles that you, as the merchant, can establish with your buyers.
What about if I set-up a recurring payment using CC instead of express checkout, are there any limitations to how many profiles you can create? Again, no (but keep in mind -- to set up a recurring payment using a credit card -- and not through Express Checkout -- requires you to sign up for Website Payments Pro with Recurring Payments).