In my opinion, this is what happened with PS addons:
Some days ago, PrestaShop changed rules for addons purchase.
As we know, when you purchase an addon on PS store, you can download upgrades for a long time.
I know very well too many developers claim PrestaShop about this rule, due they can not sell new versions to same client: they was obligated to maintain versions forever or, at least, for a long time.
Finally, PrestaShop decides to change this policy. For a side, that's reasonable if u think PrestaShop win money every module sold (commission) so, making a sell policy like WordPress Addons (yearly subscription) developers can win more money and PrestaShop win more money... It's a perfect business.
Two days ago, load traffic on PrestaShop servers was increased 1500% due all people was accesing their account and downloading all their modules and, by other side, they was receiving a lot of DDOS attacks.
As we starting to say, in my opinion, PrestaShop has committed a big mistake changing this policy because PS modules are too much expensive than WordPress and, if there are no other way, I assume this forum will start to receive thousands of modules, people probably start to build small teams to make joint purchases and PS modules incomings will decrease a lot.
Hopefully, I founded this wonderful forum a couple of days ago and I'll share all my modules.
