I'm quoting this from a response I made in a reddit thread a while back:
I'm sure that opinion will get hated on, but I agree [about using credit cards to make rep purchases]. It may be a huge pain in the dick if your card number gets stolen and used (and it seems that's the primary worry), but this is expressly why there are such strict protections in place for credit cards in the first place. As long as you have a reputable bank or credit union, they will halt and reverse any unauthorized charges if you catch them. You have the ability to chargeback if you get bamboozled. I literally have a credit card I expressly use for watch transactions and nothing else. It's just nice to have an isolated system to purchase stuff; I've bought four or five watches on it so far and haven't gotten it stolen yet (fingers crossed), and it's already come in handy once when I needed to threaten a chargeback on one of the watches that wound up never shipping. They were quick to issue the refund.
Bitcoin is nice to have the discount but honestly, have you considered that you're getting essentially a 95% discount on the actual cost of the watch you're getting? If that price factor is considered, it doesn't seem worth it to me to get an extra 40 or 50 bucks off the cost in exchange for a total loss if you get screwed. I don't think PureTime is actively out to scam people, but when a transaction goes tits up they have little incentive to actually rectify the situation and continue to put effort into making it right, so the end result is essentially the same.