I don't buy the marginal gains school of thought in its entirety but there is something to be said about how "Professional" cycling has been in the past.
Whilst Pro Cycling has been a Professional sport (in the sense of guys doing it full time for a living), the way in which it is run and athletes looked after is far from Professional.
I think it is this attitude and set of beliefs that have contributed to the doping culture within the sport and tendency to make up that last 5-10% with PEDS.
Say you are a naturally talented rider and you are doing everything you think you should be doing in order to be competitive but your training and preparation are largely old school with the input of one trainer independent of your team. Your equipment is crap, your team disorganised and your training un-monitored. The easy way to make up that last 5-10% is to go dope.
On the other hand if you have a dedicated team coach, dietician, psychologist, physiologist and the best most researched equipment money can buy it is debatable whether doping will give you that last 5-10% or whether the gain is much more minimal. Also whether it is worth the risk.
What I am getting at is that I think certain riders really struggle with the difference between these two scenarios and in the latter scenario getting their head around performing well without PEDS.
Conversely guys that feel that they in are a team that is "un-professional and old school" still feel that need to chase that extra 5-10%.
This is why I reckon somebody like Contador is in a no-win situation with the new pressure from Tinkov for results. He knows that he cant go back to the "old school" way of preparing for fear of getting busted a second time but Saxo simply don't know how to get results any other way. The same could be said of a lot of teams.
I could be wrong but I suspect there may be an element of what I have described above in the recent Rogers situation i.e. what he feel he needs in order to perform. Even if he is a victim of contaminated meat you have to ask yourself whether a "Professional" team would have allowed him to eat it in the first place?