It will not work, I have tried in the past.
I cant believe Marriott does not offer a milestone past 30 nights.
If they were to setup a huge milestone I definetely would have gone for it in the past.
Even if they did something as simple as 2K or 1.5K/night past the last milestone.
I simply quit staying with them once I hit the bonus and go elsewhere.
I think the most I have ever stayed was 1st qusarter this year where I logged 36 nights.
I might credit my 1 nighters to southwest and continue to give Marriott my one nighters this time becasue southwest is actually included in the miles promo this time.