To my knowledge you can only buy FF miles (without hotel certificates) in lots of 50,000 miles ... for 125,000 MR points. Miles and points are quite different, so don't confuse them. To fly to Hawaii business class 'usually' takes 75,000 FF miles each -- so for two people that amounts to 150,000 FF miles at a 'cost' of 375,000 MR points.
https://marriott.com/rewards/usepoints/moreairmi.mi
With the air&hotel pkgs you get Cat7 hotels & 120,000 FF miles for 270,000 MR points ... or the Cat7 pkg for 250,000 (a slightly better deal)...but both are considerably better than buying FF miles or hotel stays separately using MR points.
Comparing what you normally pay 'cash' for biz class compared to economy there is a difference sometimes as much as 500%. However, using FF miles the difference is about 50% more miles. Therein lies the difference in 'value'. While you don't 'need' to fly economy for the 10 hr flight from NYC to Hawaii, it sure is nicer in business class for such long flights!
IF your rep was correct with a $700 MF (don't forget to add the $104 fee to trade for points) getting 125,000 points for your dollars is a better deal that way, except you lose the use of your week. Having that 'option' is still a good benefit in some cases where you might not be able to use your week one year and the points are better than wasting it ... or perhaps as in my case I trade 2 weeks EY to replenish MR points I've used on my EOY trips. In addition, as suggested here, Marriott might make the 'purchase points' option a plan of very short duration - so I'd buy the MR points now if you are in need.
If the 'buy 99,000 points' plan stays, I suspect it was put in for a number of reasons, only guesswork on my part: 1. to encourage people to 'top up' and take a great trip sooner than later; 2. to encourage those who bought 'resale' to be more active in using points; 3. to introduce vastly higher purchase incentives to buy direct ... back to the half million days for a $20,000 purchase. 4. a prelude to a huge bump in the number of reward points you might need for future trips -- so use your points
now.
Right now I look upon this as a way for my kids to put a pile of points in their own MR accounts and get some nice trips too.
Personally, I don't think anyone is the loser with Marriott - they've rewarded me nicely as a direct buyer of their timeshares ... as well as a stockowner as when I bought a $20,000 TS from them I also matched that amount in MAR stock. My last purchase (number 6) was in 2002 so you can easily see how much MAR stock has gone up since then, even though I may have 'lost' money on the TS prices I paid (if you don't take into account the 2 million+ MR points I got as incentives to buy that way). It's been a good marriage for me.
Brian