yes,
Some people concentrate in on their particulars. but some people concentrate on every fields. it can be a game or any other fields.Just like in internet field deciding how big a country you are - or you can realistically be-is an imporatant strategic decision .Indeed, if you hire an SEO specialist, he should be able to help you make that call.Just remember , the more searches you want to rank for, and the more competative those searches are,the deeper pockets you will need.