My first domain sale was from a domain that I unfortunately registered at Yahoo to take advantage of their $2.99 pricing. The sale came about 2 weeks after registering the domain and it was for a nice amount. I found myself frantically trying to find out how to push the domain since I could not transfer it (it was within the 60 days). I found out that you can not in fact push domains from one account to another. So I ended up having to give the buyer my yahoo account, which I had been using for about 5 years. Fortunately, that was the only domain I had there. But it was a headache to say the least, and the buyer never updated the credit card info, so I actually got charged for a renewal a year later . I've since canceled that card
For the price of the sale at that time, it was worth it, but its was a major PITA.