I am a SEN, and I barely qualify for SEN every requalification year. I live in the US, and I do around 3-4 RTs a year in paid C between the US and DE, and that's it. The years I don't have requalify, I burn my miles and usually credit very little if anything to M&M.

I used to fly United for domestic flights, but I moved my business over to Virgin America, which I like a lot better. What's refreshing about VX is that they do not have any status, and upgrades to First Class are purely on a first come first serve basis for cash payment, so I always fly First Class by paying just $250 / flight. Much better deal than United. Not to mention, they have Internet on all planes and their F is much newer and IMHO nicer than United's.

I would def. do this promotion for 10k euros to make HON: I would get 2 1/2 years of HON and 2 years of SEN (without having to requalify for that SEN). That's 4 1/2 years of status. Plus, with 600k miles, I can buy 6 RT award flights between the US and Germany, that alone has a value of 6 * $3500 (assuming Z class) = $21000 = 15k EUR. Not to mention that I prefer taking award flights than booking in Z class, because I am not subject to the 50 day advance booking requirement.

Plus 6 evouchers = 3 upgrades to F when I am on paid tickets.

Re: HON. I don't think people like me would "dilute" HON benefits that much. If I use HON lounges 6-8 times a year, that hardly makes a difference. On the other hand, whenever I fly domestic LH in Germany, around 50% of the time when I see HONs being driven to the plane, they end up sitting in Y. I think people like these, no matter how they made HON, are much more of a hassle to FCL's than I would be. They probably fly Y all the time, and every time they pay just $99 for a ticket, but need special FCL attention.