If you are looking to work as a contractor, into major IT suppliers or clients then I'd say yes - professional accreditations are increasingly necessary to open the door for an interview.
From your "
freelance work in the evenings and weekends" I wonder whether you are actually looking to work for private individuals (fixing PCs, setting up home wireless etc). If so, just get yourself a horse and some spurs and you'll fit in with 99% of the competition
RC