One issue with Web Site Payments Pro that might affect some HNers is that Paypal will deny Third Party Payment Aggregation business models almost 100% of the time. Stripe has no issues with TPPA as long as you don't start getting tons of chargebacks. Stripe FTW.
In addition to any other requirements or restrictions set forth in this Agreement, you shall not: ...(iii) act as a payment intermediary or aggregator or otherwise resell our services on behalf of any third party...
