Everything happen for a reason. You doesnt know the existing of adsense in the past then make you more notice to nowaday PPC program. Or this can describe as "Karma".That is nothing to regret about. Make yourself free and happy.
one of them is, sold a site few months ago for xx,xxx - got 12k uniques a day, a week after i sold it , it went up to 23k uniques a day, pagerank shot up for a bunch of great keywords ;( oh well, my loss.
i regret I sold TASR when it was at around $2.00/ share . I regret ever getting married with my baby mama. I not choosing a major earlier I regret going from adult to non-adult I regret not building and focusing on one site at a time. I regret not learning php. I regret not doing what I want but doing what everybody else wants. I regret not going away for college. i regret sleeping with that girl. I regret making this post I hope one day I won't regret making this post.
My biggest regret is still $50 paid for one year reseller hosting, 15GB webspace, 150GB bandwidth, unlimited domains, cpanel/whm, private name servers and a dedicated IP. Sounds pretty cool, huh? Well, a really nightmare! I had a reseller account on this server about two years ago but over time server performance got worse, and worse with no support service at all. I packed my bags and went away, but past August I got a message from the company explaining the reasons of past issues and offering the above package as special deal for customer wanting to get back and try improved services. I took the package in the belief I was talking to a respectable business man, according to what I heard from his early customer support. Everything was ok until problems arised again with IP changes, cpanel misconfigurations, etc. etc., later I found that the respectable man is just a teenager playing with servers with no idea on what he is doing. Today the site is up and down again and again and he changed the original, well-designed resellers website for a kiddy-like pseudo portal serving his city. Of course he removed all forms of reseller/hosting contact and there is no support service. I have my own server but I don't want to take the risk hosting somebody else on it, that's why I got a reseller apart, the worst idea ever.
Hm. I regret a lot of things with my business, sadly. I regret not going into article marketing hardcore sooner. I regret all the time I wasted with traffic exchanges because I didn't know how to use them. I regret spending a lot of money with memberships to some organization I never bothered with, all for nothing. I regret not learning the basics of SEO sooner. and a lot more I don't feel like thinking about right now. *sigh*
I regret wasting so much time in the past before I discovered the wonderful world of internet business and marketing. Other than that, I don't regret anything. You miss 100% of the shots you don't take
My biggest regret is probably never using meta-tags on my first website. Haha, I know it was dumb of me.