no, not at all - I would also ask a such question once an expected mail has not arrived for three days. We are all humans (even if I am not always sure in this sapience attribute )
I sent payment via PayPal on April 14 and the application form by post the next day. Have you received them, and if so when may I expect the account to be opened?
generally the accounts are shell activated when: the application form arrives AND the application fee is paid AND the "to be shell activated" template account exists.
The user is notified by e-mail - usually with subject line "polarhome shell activated".