I understand what you're saying.
I never said that there wasn't a "need" for items like this. I guess the operative phrase is "budget-friendly". And also, as I said, with a 2.5 battery life this would not suffice for an event you described as it wouldn't last long enough and batteries would still need to be replaced (I realize there is no perfect setup for "every" situation).
Perhaps this will meet your needs. However, as I stated, "I" cannot justify the cost. Perhaps you can. Good luck in all your endeavors.
At the moment it is still well outside of OUR budget but at 1/2 the price of the competitor the odds are looking better.