No, I don't think you have wasted your money by spending it on facebook ads.
This has to win most obvious post of the year award!
My aim was to get leads from Facebook. Completion was sale of reselling web templates, web hosting packages and digital products (ebooks, courses)
I don't think I sold one, and I believe I got poor reaches and poor engagements.
Where did I go wrong? Should I have spent it on Adwords?
Wait, you don't think you sold one or you know you definitely didn't sell one from the campaign?
I don't think you "wasted" your money. Because you learned something from it.
You might not have made any sales from it, but you learned something new about whether using FB ads is successful for what you're trying to sell.
Without knowing what the actual product/service is you are promoting and without knowing what filters and geo targeting options you set.
Let alone without knowing what image you used, what text etc that you used in the ad, it's really hard to say where you went wrong or if you even did go wrong.
Like someone else has said here though, a $50 spend is not really a sufficient enough spend to know.
Some people spend up to $1000 on just experimenting alone. That's what it's all about, experimenting.
Trying to find the best most optimized ad that works best for you.
Also, what time you have that ad shown can also greatly effect its performance and ROI.
Example; some of your most likely buyers might not even use Facebook until the evening time.
Some of them might only use it in the morning, some people only buy on evenings (most people are like this).
Because generally that's when people have more free time as opposed to the mornings when they're busy and rushing around.
Just something to consider.
Personally, I do think it would have been better invested in some other advertising platform. Adwords or Bing ads for example.
My reason for that is because you can generally reach a wider audience and get more bang for your buck.
Facebook can be a right money suck before you even make any sales from it.
But some people do get a lot of success from it but you can bet your front teeth that they invested a lot before they got that science perfected.