It's mainly due to such wording on the sites as "only invite your friends and those whom you trust, or you risk your entire invite tree being disabled", so it turns into a sort of protectionism and self preservation of sorts.
And when you realise that inviting noobs from here that openly post requests is considered a serious enough offence for some to lose their accounts, or their privileges such as invites removed for life, and if you have been around long enough to see 100s of requests and 100s of failures it's easy to fall into a condescending mode, don't be upset by it, embrace it and join in the fun, post funny & sarcy & witty responses back, people will remember you more for that than getting all huffy and offended by posts on the interwebz
It's the old adage, and cliché, of make friends and prove to others that a site is missing out on not having you as a member, rather than persistently posting & begging for an invite.
Remember, less is equal to more.
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