It's an incidental feature of Israeli voting patterns being dominated by ethnic and sectarian cleavages; Sephardic and Mizrahi families (who arrived following ethnic cleansing in the wider region from the 1950s onwards) are on average much lower down the income scale than Ashkenazi ones, etc.
And
also because Left and Right don't exactly mean the same in Israel as elsewhere, denoting positions on existential/peace/security (use whatever word of combination of words you like best) as much as socio-economic matters. So pretty much uniquely for a secular party of the mainstream right the Likud is traditionally not explicitly antisocialist.
But then with party loyalties being so weak in Israel it's probably not so wise to act as if generalisations of the norm are ironcast or something; certainly the patterns on display in the 2006 election were... er...
different.