thogu61: Thanks for the advice, but unfortunately - I like doint transactions over the weekend, because you have more time to overthink, what you are doing than during working days.
My advice for transactions on steam is this: don't do transactions on friday afternoon around 4:00 p.m. - I've already had some two or three times problems then. On all other times it worked fine however...
011284mm: Well you sound like you have a clear head, so you should be okay. If you ever need advice, the community around here is really helpful and they seem to be really nice people.
The thing to remember is that GOG are games suppliers. So the idea is to have fun, both on and off-line here.
No, no - you are absolutely right to warn me, I already had to make the experience earlier, what might happen, if you loose control of your wallet, in front of a screen loaded with hot offers. And if it concerns games, I definitely tend to be sometimes over-enthusiastic. But actually there is no danger spending too much money at one time.