Hi Julito
Of course it is worth it without thinking should send mails of support even if it is inactive PSA or CSA members, because you never know when they will decide to work again, when they see how much they support you give, help, to inform them about all the news and when they see that you still doing this job will create their image that they can succeed in this business, and it will work. Just be persistent and continue to send those e-mails, you will pay off one day