Well I don't know about you, but I don't just vote to further my own interests. And even if the UK leaves, it's still my continent, which I remain a citizen of. And it IS going to matter here because the way things are going, the UK is going to continue following and taking most of the rules.
It's touchingly naive that you think voters have any impact on the way the European Project is run. The whole purpose of the project has never been to represent them in supranational governance but to remove them from the process so they cannot interfere.
Ditto the idea that the UK as a member had the slightest influence. We never had, as has been demonstrated countless times. The Project cannot be reformed from within. It has been expressly designed to prevent this. The senior ideologues who hold the power are not elected. They answer only to each other and only the most fanatical Euro-imperialist are ever promoted to the inner circle.
The only lasting and prosperous future for Europe is as a fraternity of independent nation states cooperating as friends and neighbours without political union. There is no way to achieve this through project Imperial Europe. The best thing the UK can do is withdraw completely and absolutely and encourage others to do the same, with the promise of bilateral treaties for those that follow and thereby rebuild Europe not as an imperial pan-continental Babel but a brotherhood of grown up nations acting in concert where it matters and respecting one another's differences where it does not. Europe does not hegemony, convergence, "ever closer union" or a grand central government. This is the moment for the UK to lead by example as we have done in the past.