Absolutely. The $60 donation is simply a suggestion. Most WDA members who make a donation on their dues statement give the suggested donation, because it is a simple way to show support. When opting for the six installments payment plan, your donation is broken down to just $10 per month making it affordable for almost everyone.
If your budget allows for a larger donation or you would like to show support, but $60 is not practical for you, you may indicate a different donation amount on your dues statement and adjust your payment accordingly.