No. Once you pass your test, and receive your certificate, you are certified for life. For instance if do great on your exam, and thereby get your SEO Certification, get Web Analytics Certified or a Social Media Marketing Certification, then you have it, and we will not ask you to give it back to us, or remove it from your LinkedIn profile, CV or resume. Once you pass the test, the certification is yours to keep.
It also shows that you need substantial traffic to make much money through advertising. At a CPM Of £10 with 2 ad units on the site, you would make just £4,000 per month even with a million page views per month for which you serve paid ads to 20% of the audience. Set this to 100% if you are selling all your ad inventory, as for example through Google Adsense.