“Leave to appeal costs is granted rarely and only in “obvious cases where the party seeking leave convinces the court there are ‘strong grounds upon which the appellate court could find that the judge erred in exercising his discretion’”: Brad-Jay Investments Ltd. v. Szijjarto (2006), 2006 CanLII 42636 (ON CA), 218 O.A.C. 315 (C.A.), at para. 21, leave to appeal refused, [2007] S.C.C.A. No. 92.”