...we do not have enough paying members at now
Everywhere I go there's at least one "at now." No offense, really, but it's starting to drive me nuts.
There is no such thing in the English language as "at now." In most cases where I see it, the meaning is "right now" or "currently."
Since "at" is a proposition, "at now" would be a prepositional phrase if it were correct. Prepositional phrases have objects, which are nouns or pronouns. "Now" is an adverb and cannot be the object of a preposition. (Don't worry - even native speakers don't understand prepositions.)
It's also often redundant since "currently" simply means present tense, and the verb is already present tense. "... is growing faster..." already means at the present time so adding an adverb that means at the present time is redundant. Unless you're wanting to stress "right now" a little bit more, like trying to stress something as a current situation that perhaps needs changing.