I got to wondering about how many Sage Developers there really are as opposed to the 750 odd that Sage claim on their web site. The 750 figure presumably includes Developers for all the various Sage products.
For Sage Lne 50 my guess is that there are probably around 40 paid up members of the Developer program.
I've based this guesstimate on the number of Developers you can find on Google without looking too hard, working on the basis that if you have paid £1500 for a Sage Developers license (then £1200 every year) you are probably going to want people to know about it or have a product that uses the Sage Data Objects.
Enough to give the Sage user a reasonable choice but not as many as you might think.