Paypal vs Clickbank for conversions?

I've been working on my first product in the IM niche and I've actually been having a blast tinkering with it trying to improve the metrics.

What I've got is my sales page with a video, a sales button, written copy and another sales button. The sales button is actually a prettylink so I can track the CTR on the 'buy buttons'

To make up for this extra page - I'm actually giving them a discount for the moment so I can tinker with the metrics and track them properly. So even after they click 'buy' it tells them they're getting it cheaper.

I know that doesn't make sense for the bottom line but it's the only way I know to track the CTR and it's temporary while I improve it and see what works.

So I set this up this morning and so far I've had 8 clicks on the 'buy' buttons but only one sale.

The buy buttons are clearly marked with a price, and both the video and copy is pretty clear on what they're getting. The call to action buttons also have paypal/credit card logos below them. And the price is actually in a h3 tag right above it.

So I'm pretty sure they know that button is for buying it - but when it takes them to a paypal payment screen... somethings going wrong.

I know every niche is different but I'm wondering if perhaps selling straight through paypal looks a little cheap? Might my conversions increase if I use something like Clickbank?

Any suggestions much appreciated.