I do like these spells or rituals. I think that having something that explicitly takes a significant investment in time, talent, and wealth adds to the realism of the campaign. Great works take great effort.
That said, for teleport circle I don't require the magician cast the spell daily, but rather monthly. Starting and hour before and ending an hour after twilight, the magician performs the ritual in full view of Sola and Monas, the Sun and Moon at Full, at a liminal time in order to facilitate a liminal method of travel. After a year, all of the variations of the ley lines' flow are accounted for and the circle is activated. Having it cast daily gives me a modern, workman-like feel that sucks all of the mystery out of it. Having the ritual periodically timed also allows the adventurers to go out for short excursions.
Importantly, things like this are a bag of plot hooks. Who will come to disrupt the ritual? Is there a foe of the party that is doing their own, and how would you disrupt theirs?
Well, for the scroll it looks like there was some backpedalling. For me, you would need 12 scrolls and it would still take a year. For the helm, that cost is astoundingly cheap for the level of teleport. Regardless of the correctness of the calculation, one made in my campaign would be much more expensive. Is 2000 gp still the price of a common item?