Do I need to show 20,000 THB when returning to Thailand with a re-entry permit on an ED visa extension?

The question concerns whether a traveler returning to Thailand from the UK with a re-entry permit on an ED visa extension needs to show proof of funds, specifically 20,000 THB. The community response suggests that while it's not very common for individuals on visa extensions to be asked for proof of funds, it is advisable to be prepared in case it is requested. It's noted that carrying 20,000 THB or an equivalent in another currency, like euros, could be wise.