Why are personal relevance, self$-$concept, and values important for motivation?

All of these.

Because of involvement, it can be conceptualized along a continuum of personal meaningfulness.

Because they are.

Because of involvement, motivation is affected when consumers regard something as: Personally relevant $($consistent with their self$-$concept, values, needs, goals, and self$-$control processes$)$; Perceived to be risky; and$/$or Moderately inconsistent with their attitudes.