I've had this happen a couple of times now and I'm currently looking for a way to not make it happen again.
Here's what happens:
1. Customer places an order.
2. Customer forgot a part and places a second order for the missing piece.
3. The second order is for $0.17 because of combined orders.
On the second order I'm basically handing over the parts for little to no money in MY pocket.
Paypal takes the fee of $0.10 (thankfully I have a micropayments account or else it would be $0.50), I'm annoyed that because of a second transaction I have to pay the base fee again.
BrickOwl takes their fee of $0.01 (0.00425 but I rounded to an actual penny)
That's 65% of the value of the part in fees.
I'd prefer it if a second order has to meet a minimum value to be placed, say $1.00, or not allowed at all.
Comments
I agree with you on the concern about losing $ on small additions to existing orders, I had the same concern after my first few orders. It wouldn't be a problem if the initial order hadn't been paid yet.