Reading this wiki;
http://en.wikipedia.org/wiki/Doping_...Tour_de_France sums it up...It's a pretty solid collection of the tours and those who doped. You'll notice a recurring theme amongst the top cyclists. So if you think someone can beat a bunch of dopers cleanly..ok, you're entitled to your opinion. I think he cheated based on the evidence out there. I also don't think athletes who are clean have any possible way of keeping pace with those that dope. Especially in cycling. The advantages are just too great. Nothing against Lance, I think what he did with his exposure is great, so I don't really care too much about this. It certainly isn't surprising. Somehow, not sure what it is, it's kind of sad to see him give up after all this time. It kind of reminds me of the Pete Rose incident. Deny deny deny and then basically throw up your hands and say "Yep, I did it". Just quitting. I guess if you're guilty, it starts to weigh on you more and more. I know if it were me, and I were innocent, I'd keep fighting out of principal.
Cost be damned. Reputation is worth more then money at the end of the day for me.
I really wish I still had a link to it (perhaps it was in a magazine), but there was a fantastic article I read a few years back, written about some no-name cyclist in his mid 30s who did a clinical trial with a cocktail of doping agents (under medical supervision). He spelled out his routine, the cost and how it made him basically feel like a 20 year old. It also made HGH sound like a wonder drug.