I think the problem is two-fold for me, as a new vaper. First, I know that I'm going to outgrow my 808d gear soon, so I don't want to stock up on too much stuff if it means I get to upgrade to twists or something else sooner. In the same way, I'm still in the "trying out flavours" stage. I already spent probably close to $100 on juices I don't really like (fruit flavours, yuck) or that are the wrong strength for me, but I think in the end I'm out less for buying a bunch of 5mL samplers at $5 a pop than 30mL bottles for $15.
The other frustration I have is that it seems like the best hardware vendors don't sell good juice, and vice-versa. So even if I only want carts and a bottle of juice, I'm still paying for shipping twice.
A 510-808/901 adapter is only a few dollars and then you can use all your stuff you have now with the Twist or any other 510 PV. I just wanted to let you know in case you find 808 stuff that you really like. It can still be used, so you don't have to use it all up before you upgrade. (Maybe that will help you upgrade sooner!) Lol