It's only $17.60 if you spiked and sent 100,000 emails in a month, so the costs are truly miminal.
It does not matter whether it is 20, 50 or 150 USD per newsletter. It is just a simple decision whether I am willing to pay for a service which is not at all better than the free solution. Where is the value added for me to pay for this?
Why people complain, if XF would increase its price by i.e. by 20 USD per licence, but are willing to pay this price on a MONTHLY (depending on your frequency even more) without hesitation, if you can have it for free? What is the logic behind this? Please help me to understand this.
If I want to use an external newsletter system outside of XF, I will always prefer phplist. It can do EVERYTHING with it. It works since years VERY reliable, it easy to customize, it is always up to date for legal requirements (double optin and optout, bounced email management, throtelling, selective batches for specific domainnames, you name it...)
So please explain me, what you can do with a payed service, what I can not do with the absolutely free script phplist?
IMHO, if there should be used an external bridge to another newsletter system at all, it would be smart to use first phplist, because it is for free and if needed later on also other services.
But for sure an independant addon which is based only on XF and nothing else is the "real thing". Sooner or later it will come. Whether with this addon here or with another one does not matter.