The only way I can describe Skype is with "it's a virus". I would never install this on my computer - not to talk to some other Skype user either.
It is proprietary software, is non free, is run by an autocompetitive and closed company, attempts to read BIOS settings, specifically attempts to prevent reverse engineering, has an incomplete and untrustworthy uninstall procedure, tries to make you pay Microsoft (they don't deserve it!), has no evidence against containing spying mechanisms, discriminates regionally and much more.
Skype is NOT a virus. And it is indeed free to call whoever you want and add as many people you want to the call.
All in all, your reasons are not very reasonable. Its the best program that ive seen, with higher quality calls and 0 lag.
Have fun with laggy ventrillo or the laggy, low quality steam voice chat.