All kinds of theories out there, New designs coming, closing out this model, etc, etc.
Many dealers have this available now, and like most advise giving the right a dealer a call might surprise you on an even more discounted price.
The truth is nobody really knows the thinking behind this and the similar deal on the T2 classic that aren't on the inside at FTP.
I can tell you my theory..
Coming from a retail background it could be that the bulk of the F series flagship units along with the T2's are usually sold in the LTD, SE top of the line configurations that have all the whistles and bells.
I have noticed by monitoring most forums and sections relating to the F series detectors, (because I have one myself and I am always looking for tips and techniques or to share any I know), that many come on board stating they just got one or are asking about opinions on getting one.
Add them all up over time and the bulk of them are mostly talking about the fully featured units, not the basic model now being sold in these promotions.
Some still have the original versions from the old days, some refer to a deal they are looking at used on the basic model but new...most of the time it is going to be the LTD they are referring to.
This is especially true for the more experienced hunters that made a decision to upgrade and know and fully understand what those extra features are and to what degree they might be advantageous to them.
For those asking about the standard model, newbies or whoever, look at how many other owners come on and recommend saving up more and just going for the top line boost units which is a very popular feature.
In this hobby for many they believe using the top of the mark tools just makes sense to have the best shot at success...more features, more treasure.
Plus, for those that can afford to spend the still pretty good amount of money on the basic model a few hundred more for the big guys is not really a big stretch if you think about it that way.
This is one hobby that can pay for itself pretty easily after all.
Maybe the factory warehouse is a bit overloaded on the basic models, some larger stocking dealers might be also, and this could just be a stocking level adjustment in an effort to reflect actual sales numbers on these different models.
Nobody likes or has any advantages if your stock is unbalanced...especially on the higher priced products.
In business discounting slow moving products to sell them fast and free up money already invested and just sitting there for other more logical places to spend it is pretty common thinking.
I think they had that promotion on the T2 and it worked so well they decided to do it on the F75 too and a few other units soon also from what I am reading.
In this industry most manufacturers seem to keep info to themselves till they are ready to make a move whether that would be about new products about to be released or existing models about to be discontinued so like the X Files show always used to say..."The truth is out there"...but we customers are usually not in the loop.
If or when a major announcement is made we will know something.
Till then it is all speculation.