If Marquez is not deserving of a major sponsor then no rider is, he has been a stand out talent and an exciting rider to watch as he has risen from his time on KTM to where he is now. having a bespoke chassis built to his specifications is just a negative twist on the idea of him being a leader and development focus, considering the fact that he was clearly the best rider Suter had last year and their only realistic shot at a title that position is understandable, if there is a gripe to be had it is with Eskil Suter, not the guy getting the job done convincingly. Bradley Smith has a bespoke chassis built to his specifications, as did Stephan Bradl last year (arguably at the expense of the Pons team). Marquez's stature offers certain advantages, but it also has its drawbacks and they were clearly highlighted several times last year. The small rider/straight line advantage thing can be discussed all day without a convincing conclusion in either way. I will concede that Marquez rode a sloppily in this race by the standards we have come to expect from him, he is usually pretty clinical. But let's not forget that he is naturally a bit rusty considering the long recovery he has undergone from last year, it is impressive that he managed to win the first race with so little track time under his bealt. I know he isn't immune to mistakes, but this a junior class and he is still a young rider, he is not the first up and coming superstar to make mistakes like this and he will not be the last.
You say that people don't resent success they resent success they feel is undeserved, that would be quite a reasonable position if the reasons for believing it is undeserved were well founded. In this case it seems they are based in a bitterness that in principle cannot be rationalised. To suggest his success in Ignoble is fairly disrespectful of what it takes to be successful in motorsport at this level, and your comparison of him to a yuppie suggests a stance of jealousy/envy based on an unrealistic notion of equality, fairness and entitlement