Personally I love EMT, but not for buying online. In the past the odd time I've had problems buying online, my bank's response was: "Since you did authorize it, we can't do anything. We'll start an investigation and get back to you in 3 months" and Visa's was: "We'll credit that back to your account, it will show up within a few minutes and we will start an investigation, keeping you informed of the progress." I have not had any problems with Canadian e-cigarette related vendors, but still it's a personal preference for a reason.
I also think part of reason Canadian vendors don't accept credit cards is the start-up cost and/or 2-3% vendors lose accepting accepting them, instead passing off fees to customers. Yes that $1.50 is a pet peeve, because I make a lot of small orders currently to try out many vendors. I know there are ecommerce companies that will look the other way in Canada for the % they make to provide credit card services, even if in small print they run the slight risk of the company cancelling service at some point.
Gentlemensreserve will accept credit cards, but are on the pricey side as well and as said, many other vendors will make an exception if you contact them.
Well e-transfers are really the same as doing a debit purchase, you settle on the merchandise you will receive, you give them the payment, and you get the merchandise. The only difference online is that there is a lag. To be honest if someone screws you around here you're screwed, whereby if you've used a credit card you can ask for the money to be credited back, called a chargeback. Vendors don't generally commit fraud with major credit cards as they know the consequences, not only chargebacks but risking losing their ability to use them if too many of these go through unjustified.
On the other side of the coin, when you send an e-transfer you know exactly what the risk is, which is the amount of the transfer and no more. With credit cards, they have your card number and can do whatever they want with it essentially, so there's a level of trust here as well. So if you are dealing with a dishonest vendor, you've got potential problems as well, although the damage can be fixed more quickly.
If you are dealing with honest merchants then there's no problem here either way. So I think that this is what we need to focus on, we know that credit card processing is going to be a problem up here for the most part, and if you want the best selection and prices among Canadian vendors then you're going to need to look at e-transfers.
You could always order from the U.S. or China where you can use your credit card and get even better prices and selection generally, but you're going to have to wait longer for your stuff to arrive, and take a small risk that it may not go through Customs. From my experience and others, that's hardly even a consideration though, but it does happen rarely.
So like many things in life, it's a trade-off, I've used e-transfers several times with Canadian vendors who are known to the community to be reputable and have had no problems. If you are curious about a particular vendor then if you ask about them in this forum I'm sure that there are people who will be more than happy to give you their feedback.