I see several posible reasons for selling both

1) Even though you are equilibrating $84 to $89, there are people that will say the analog is cheaper. Look how many people have bought an ASP engine to save a few bucks from an OS, only to mostly regret not spending the extra $5-10(not taking shots here, just my personal experience) Also, 5 servos $5 difference equals saving $25, and more for other brands differing prices between dig and analog.

2) They may still have stock to reduce and sell, but not manufacturing anymore. Can't just throw them away as a viable business.

3) To give builders and pilots the choice. It looks good to have a number of different servos available.

4) Some people just don't want to switch or upgrade and why change what has worked, including the battery mah.

5) Lastly, we just bought a pair of converse court shoes for my daughter that look exactly like they did 30 years ago, just cost a lot more now.

Ed