OSPF DR and BDR election

Hello Experts

While going through the DR and BDR election process. I gone through a line
wherein during the process of election the router will segregate the list
of routers who have mentioned themselves as BDR and those who have
mentioned themselves as DR.

After segregation out of the list of BDR, the elected BDR will be with the
highest priority and if not then highest Router ID.

Now my question is .. Why would a router will opt himself for BDR and not
for DR. Or we can say how a router will come to conclusion that it has to
go for be a BDR not the DR.

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Thanks&regards
Vishal
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