Well, kind of.
Most bodybuilders will take a "sponsorship" even if it means zero bucks and only their name/pic on a website or a mag. But I don't know what kind of deal you have and I doubt you'd tell, which I understand.
I don't like prop blends either. But I have used Scivation's Xtend and it has a good rep for quality so I chose this for comparison. Plus the few proven ingredients are in dosages that have been shown to work in some studies (of course you can discuss whether it's worth to supplements for perhaps a relatively tiny effect). Most of the effect from that supp would be from the Brain Drive part and perhaps a small effect from the citrulline and beta alanine if used long term. I wouldn't pay for this product either. 
In regards to your first part, i'm not sure what part of my agreement with them I'm allowed or not allowed to talk about publicly, so I'll leave that info out so I don't get in trouble :-D , but I will say that it revolves mainly around product, with that being said, I use the product everyday I work out, and if it didn't work I wouldn't use it, whats the point of using a product that doesn't work. and I REALLY do use it. I didn't do it for magazines or websites or whatever, I've been featured in magazines, on websites, and even have my own website. So I REALLY do use it! lol
In regards to Scivation, I've never used VasoCharge (or Maybe have ONCE), but I used Xtend for an extended period time (no pun intended), and it is a good product, but honestly its expensive and I think there are other products that have a better formulation (one of those products being Chains from Phenom Labs).
For NO I've used Gaspari Superpump a few times and that upset my stomach everytime I used it, everytime! and I consider myself to have a strong stomach. NO-Xplode was alright, but I felt that I had to increase my dosage after sometime or the sensation wasn't there (maybe its mental I really can't say), I used Nitrix also from BSN and didn't feel anything.... And I felt NOTHING with Muscletech NaNo Vapor, so as Groink said for his product, Herculean Xtreme did for me EXACTLY what its advertised to do, and that makes me happy.
I'm in no way trying to knock other companies, thats not the point of this message.... I'm just telling you what MY experience is. and What I believe of the company whose products I use!