hate to hijack a thread but it never hurts to let people know what they can do with a cheap saw. here's some pics of a doubler plate i made to mount a horn on an aluminum workboat. it is 1/2 by 6 AL/FB.
to the OP; 15 sheets is a good amount of expando to be cutting daily. volume frequently drives tooling choice, to me it sounds like you're a little under tooled.
a shear's cost is dependent on a number of factors but if i was doing 60 sheets of exp metal a week i'd be looking at alternatives. if you search google , cutting exp metal with plasma you will pull up a number of threads dealing with this. some of the poster's use it successfully. i worked for some very big, high end job shops so i am, or have been accustomed to some serious metal working machinery.
good luck, skip it, if it's working for you then that's good enough.