DC is small. Without the Federal government, it'd basically be an exurb of Baltimore. I am not too concerned by how much the motorcades are tying up DC traffic.
The Secret Service (or FPS or whatever it was) closed down chunks of Chicago in '08. It wasn't too much then. I don't know what too much is, but nothing I've heard about what they're actually doing sounds like "too much" to me.
However, it is simply not my job to make this determination. I don't have all of the facts, and neither do you.
Of course, it's not either of our immediate jobs to do any of that, but that's not what I was asking. You seem to be very good at bringing up everything else in the world but the answer to the logical follow-up question your post implied.
If you want to say that there is no limit at all to the amount of funds and inconvenience your would incur for the safety of the president, that's a perfectly fine position. Just come out and say it. I think you know, however, that it's untenable, hence all the hemming and hawing over your opinion of DC, or your ignorance of the actual facts, or of our ability for you or I to make such complex decisions.
So you're not going to answer. That's fine. Been nice chatting with you. :)