Sure! You can certainly ask questions like that! And given the huge breadth of knowledge on FreeRepublic, you'll find you have the answer in fairly short order.
My opinion on your question: I haven't worked the numbers but if you can find a copy of Win7 Pro pretty cheap (and they are going for pretty cheap now that regular support has ended and it's on extended support, meaning no new features), my guess is that it's worth it.
In my opinion, Win 7 has it all over XP and Vista. XP was great for its time but it's wildly obsolete and insecure by comparison. And Vista was just a turkey. Win 7 came out real nice and works great -- that's what I'm running on all my production Windows boxes (other than testing systems). Win 10 looks to be another winner like 7.
WIN 7 is like WIN95 OSR2 .. But it didn’t handle USB. I still have a nice old Sony desktop getting dusty. OH WELL. MOORES LAW?
IM running WIN 7 Prof on a new laptop. XP was OK. WIN7 muoy better.
I remember the beginning of Microstiff and its realm.. Now Gates sprays us and vaccinates us on PCs and laptops and our bodies too.