Hilo in c # console application with nhibernate

Having a console application that many will start over and over again using hilo. Every time the application is started and the sessionfactory is rebuilt, the hilo (next_hi) columns will grow and the id space reserved will be lost.

Does anyone have any experience with this?

Can't be a nice feature for a hilo generator of choice remember high and low values ​​for applications that are often closed by many users? I mean, he already reserved the identity space, which is often not fully utilized in this environment.

Thanks for sharing your experience in advance!