Battery Isolators - How do they work? Do you need one?

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i think for some people,it may be an good $$ move...let me explain...

i got a agm batt new for 60$,but cant find an other one at that price...and i need the 2 battery....what can i do if i dont have this isolator??nothing...

2 agm batt cost like 200$ each minimum in canada,so 400$...

and i got an battery isolator diode(60$) and agm batt(60$) for 120$...

for the same result,im maybe cheap,but i prefer to pay 120$ than 400$ for the (almost) same power,to boost up my 1000w amp...without dimming...