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I totally agree! Herve is a great guy who is a big supporter of XOOPS, and who has spent countless hours developing for XOOPS and supporting XOOPS users. But he has to pay his bills too! As Catzwolf said - if he has to spend more time supporting his paying customers first, that makes a good business sense.
And for all of us - if you found and are using a good module, don't be afraid to donate to the developer, or to buy some other module from him to support this developer. The same is for XOOPS (hint, hint)
Trust me - each XOOPS developer would like nothing more than spend 24 hours coding for XOOPS while not having to worry about paying his rent and his bills. But if we have to pay the rent and bills, then we have to look for ways to make money, so we can support ourselves and our families. That means that sometimes we have less time for XOOPS, that sometimes we cannot respond to an email or call for support on the forums. As volunteers, we do that in our "free time", and sometimes we don't have much left of it, if other responsibilities take over.