It's unquestionably a worthwhile investment, providing an 80% return on investment.

It's definitely worth the investment.

You don't have to pay for a license and can expect cost savings on deployment. 

I have seen a return on investment since we didn't have to pay a licensing fee.

We have seen an ROI from MikroTik in that, for 12 years their equipment has been very robust. Even older versions I can still use now without any problems or stability issues.

The costs of hardware reduces the ROI dramatically. Same way the Costs of Ownership does.